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import { fromFileUrl, join } from "./src/deps.ts";import { staticFetch } from "./src/fetch.ts";import { AnyReq, TOptions } from "./src/types.ts";import { existStat, fromExtensions, modRequest, parseurl, sendFile, _next } from "./src/utils.ts";
export default function staticFiles(root: string = "", opts: TOptions = {}) {  if (typeof root !== "string") {    throw new TypeError("root path must be a string");  }  if (root[0] === "/") {    root = root.substring(1);  }  opts.index = opts.index || "index.html";  opts.maxAge = opts.maxAge || 0;  // true default  opts.fallthrough = opts.fallthrough !== false;  opts.etag = opts.etag !== false;  opts.acceptRanges = opts.acceptRanges !== false;  opts.lastModified = opts.lastModified !== false;  opts.redirect = opts.redirect !== false;  // false default  opts.dotfiles = !!opts.dotfiles;  opts.fetch = !!opts.fetch;  opts.immutable = !!opts.immutable;  opts.brotli = !!opts.brotli;  opts.gzip = !!opts.gzip;  opts.cacheControl = !!opts.cacheControl;  if (opts.setHeaders && typeof opts.setHeaders !== "function") {    throw new TypeError("option setHeaders must be function");  }  if (opts.fetch) return staticFetch(root, opts);  const rootPath = root.startsWith("file:") ? fromFileUrl(root) : root;  return async function (req: AnyReq, ...args: any) {    modRequest(req);    const res = args[0];    const next = args[1] || args[0] || ((err?: any) => _next(req, res, err));    if (opts.prefix) {      if (req.url.includes(opts.prefix)) {        req.url = req.url.substring(opts.prefix.length);      } else {        return next();      }    }    if (req.method && req.method !== "GET" && req.method !== "HEAD") {      if (opts.fallthrough) return next();      const headers = new Headers();      headers.set("Allow", "GET, HEAD");      headers.set("Content-Length", "0");      return req.__respond({ status: 405, body: "", headers });    }    let path = parseurl(req).pathname;    if (path === "/") path = "";    let pathFile: string = decodeURIComponent(join(rootPath, path));    try {      const _body = await sendFile(pathFile, opts, req, res, next);;      return _body;    } catch (err) {      let exts = fromExtensions(req, opts);      if (exts) {        let stats: any, i = 0, len = exts.length;        for (; i < len; i++) {          const ext = exts[i];          const newPathFile = pathFile + "." + ext;          stats = await existStat(newPathFile);          if (stats !== null) {            stats.pathFile = newPathFile;            break;          }        }        if (stats && stats.pathFile) {          try {            const _body = await sendFile(stats.pathFile, opts, req, res, next);            return _body;          } catch (_err) {            if (!opts.fallthrough) return next(_err);            return next();          }        }      }      if (!opts.fallthrough) return next(err);      return next();    }  };}